Turquoise Chaos Emerald

At the beginning of each upkeep, you may scry 1.
Whenever a creature enters the battlefield under
your control, you may look at the top X cards of
your library, where X is that creature's power. If
you do, put one of those cards on top of your
library and the rest on the bottom of your library
in random order.
Artifacts your opponents control enter the battlefield tapped.